Can't fit 32t cassette on Croix de Fer?

pangolin
pangolin Posts: 6,314
edited September 2017 in The workshop
I got a new cassette, tiagra 32t. I also got a 105 5701 GS mech as I understood this was large enough for 32t and compatible with tiagra 4600 shifters. But it just bangs into the 32t cog once on the bike.

What am I missing? It's a 2014 croix de fer if that makes a difference?
- Genesis Croix de Fer
- Dolan Tuono

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